Author(s):
1. Zvonko Gulisija, Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Serbia
2. Aleksandra Patarić, ITNMS, Serbia
3. Marija Mihailović, Serbia
4. Milentije Stefanović, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia

Final paper